Finding the Fourth Proportional to 28,585,402.20, 42,853,987.98 and 12,399,167.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,585,402.20 : 42,853,987.98 = 12,399,167.34 : x
2. Step 2: Convert to fraction form
   28,585,402.20/42,853,987.98 = 12,399,167.34/x
3. Step 3: Cross multiply
   28,585,402.20x = 42,853,987.98 × 12,399,167.34
4. Step 4: Simplify right side
   28,585,402.20x = 531,353,768,150,368.50
5. Step 5: Solve for x
   x = 531,353,768,150,368.50/28,585,402.20
6. Step 6: Final answer
   x = 18,588,290.78