Finding the Fourth Proportional to 139,432.88, 209,111.91 and 60,528.35

Step by Step Solution

1. Step 1: Write the proportion equation
   139,432.88 : 209,111.91 = 60,528.35 : x
2. Step 2: Convert to fraction form
   139,432.88/209,111.91 = 60,528.35/x
3. Step 3: Cross multiply
   139,432.88x = 209,111.91 × 60,528.35
4. Step 4: Simplify right side
   139,432.88x = 12,657,197,832.09
5. Step 5: Solve for x
   x = 12,657,197,832.09/139,432.88
6. Step 6: Final answer
   x = 90,776.28