Finding the Fourth Proportional to 915,730.50, 1,263,711.69 and 507,870.21

Step by Step Solution

1. Step 1: Write the proportion equation
   915,730.50 : 1,263,711.69 = 507,870.21 : x
2. Step 2: Convert to fraction form
   915,730.50/1,263,711.69 = 507,870.21/x
3. Step 3: Cross multiply
   915,730.50x = 1,263,711.69 × 507,870.21
4. Step 4: Simplify right side
   915,730.50x = 641,801,521,379.76
5. Step 5: Solve for x
   x = 641,801,521,379.76/915,730.50
6. Step 6: Final answer
   x = 700,862.89