Finding the Fourth Proportional to 1,139,433.78, 1,572,354.72 and 623,085.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,433.78 : 1,572,354.72 = 623,085.24 : x
2. Step 2: Convert to fraction form
   1,139,433.78/1,572,354.72 = 623,085.24/x
3. Step 3: Cross multiply
   1,139,433.78x = 1,572,354.72 × 623,085.24
4. Step 4: Simplify right side
   1,139,433.78x = 979,711,018,076.33
5. Step 5: Solve for x
   x = 979,711,018,076.33/1,139,433.78
6. Step 6: Final answer
   x = 859,822.69