Finding the Fourth Proportional to 139,528.68, 209,288.32 and 60,642.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,528.68 : 209,288.32 = 60,642.92 : x
2. Step 2: Convert to fraction form
   139,528.68/209,288.32 = 60,642.92/x
3. Step 3: Cross multiply
   139,528.68x = 209,288.32 × 60,642.92
4. Step 4: Simplify right side
   139,528.68x = 12,691,854,846.69
5. Step 5: Solve for x
   x = 12,691,854,846.69/139,528.68
6. Step 6: Final answer
   x = 90,962.34