Finding the Fourth Proportional to 915,144, 1,262,898.72 and 557,448

Step by Step Solution

1. Step 1: Write the proportion equation
   915,144 : 1,262,898.72 = 557,448 : x
2. Step 2: Convert to fraction form
   915,144/1,262,898.72 = 557,448/x
3. Step 3: Cross multiply
   915,144x = 1,262,898.72 × 557,448
4. Step 4: Simplify right side
   915,144x = 704,000,365,666.56
5. Step 5: Solve for x
   x = 704,000,365,666.56/915,144
6. Step 6: Final answer
   x = 769,278.24