Finding the Fourth Proportional to 139,721.53, 209,464.75 and 60,776.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,721.53 : 209,464.75 = 60,776.30 : x
2. Step 2: Convert to fraction form
   139,721.53/209,464.75 = 60,776.30/x
3. Step 3: Cross multiply
   139,721.53x = 209,464.75 × 60,776.30
4. Step 4: Simplify right side
   139,721.53x = 12,730,492,485.43
5. Step 5: Solve for x
   x = 12,730,492,485.43/139,721.53
6. Step 6: Final answer
   x = 91,113.32