Finding the Fourth Proportional to 663,510,722.50, 915,645,190.98 and 370,155,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   663,510,722.50 : 915,645,190.98 = 370,155,290.50 : x
2. Step 2: Convert to fraction form
   663,510,722.50/915,645,190.98 = 370,155,290.50/x
3. Step 3: Cross multiply
   663,510,722.50x = 915,645,190.98 × 370,155,290.50
4. Step 4: Simplify right side
   663,510,722.50x = 338,930,911,662,129,856
5. Step 5: Solve for x
   x = 338,930,911,662,129,856/663,510,722.50
6. Step 6: Final answer
   x = 510,814,520.65