Finding the Fourth Proportional to 1,158,196.96, 1,598,407.55 and 642,112.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158,196.96 : 1,598,407.55 = 642,112.79 : x
2. Step 2: Convert to fraction form
   1,158,196.96/1,598,407.55 = 642,112.79/x
3. Step 3: Cross multiply
   1,158,196.96x = 1,598,407.55 × 642,112.79
4. Step 4: Simplify right side
   1,158,196.96x = 1,026,357,931,487.56
5. Step 5: Solve for x
   x = 1,026,357,931,487.56/1,158,196.96
6. Step 6: Final answer
   x = 886,168.73