Finding the Fourth Proportional to 1,151,505.37, 1,589,080.17 and 642,240.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151,505.37 : 1,589,080.17 = 642,240.55 : x
2. Step 2: Convert to fraction form
   1,151,505.37/1,589,080.17 = 642,240.55/x
3. Step 3: Cross multiply
   1,151,505.37x = 1,589,080.17 × 642,240.55
4. Step 4: Simplify right side
   1,151,505.37x = 1,020,571,722,374.89
5. Step 5: Solve for x
   x = 1,020,571,722,374.89/1,151,505.37
6. Step 6: Final answer
   x = 886,293.50