Finding the Fourth Proportional to 139,432.62, 209,111.57 and 60,528.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,432.62 : 209,111.57 = 60,528.09 : x
2. Step 2: Convert to fraction form
   139,432.62/209,111.57 = 60,528.09/x
3. Step 3: Cross multiply
   139,432.62x = 209,111.57 × 60,528.09
4. Step 4: Simplify right side
   139,432.62x = 12,657,124,977.98
5. Step 5: Solve for x
   x = 12,657,124,977.98/139,432.62
6. Step 6: Final answer
   x = 90,775.92