Finding the Fourth Proportional to 1,238,499.50, 1,709,128.79 and 722,153.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238,499.50 : 1,709,128.79 = 722,153.75 : x
2. Step 2: Convert to fraction form
   1,238,499.50/1,709,128.79 = 722,153.75/x
3. Step 3: Cross multiply
   1,238,499.50x = 1,709,128.79 × 722,153.75
4. Step 4: Simplify right side
   1,238,499.50x = 1,234,253,761,320.69
5. Step 5: Solve for x
   x = 1,234,253,761,320.69/1,238,499.50
6. Step 6: Final answer
   x = 996,571.87