Finding the Fourth Proportional to 915,624, 1,263,561.12 and 513,216

Step by Step Solution

1. Step 1: Write the proportion equation
   915,624 : 1,263,561.12 = 513,216 : x
2. Step 2: Convert to fraction form
   915,624/1,263,561.12 = 513,216/x
3. Step 3: Cross multiply
   915,624x = 1,263,561.12 × 513,216
4. Step 4: Simplify right side
   915,624x = 648,479,783,761.92
5. Step 5: Solve for x
   x = 648,479,783,761.92/915,624
6. Step 6: Final answer
   x = 708,238.08