Finding the Fourth Proportional to 1,158,868.88, 1,599,242.56 and 642,659.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158,868.88 : 1,599,242.56 = 642,659.12 : x
2. Step 2: Convert to fraction form
   1,158,868.88/1,599,242.56 = 642,659.12/x
3. Step 3: Cross multiply
   1,158,868.88x = 1,599,242.56 × 642,659.12
4. Step 4: Simplify right side
   1,158,868.88x = 1,027,767,816,276.15
5. Step 5: Solve for x
   x = 1,027,767,816,276.15/1,158,868.88
6. Step 6: Final answer
   x = 886,871.53