Finding the Fourth Proportional to 139,087.52, 208,631.84 and 97,719.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,087.52 : 208,631.84 = 97,719.20 : x
2. Step 2: Convert to fraction form
   139,087.52/208,631.84 = 97,719.20/x
3. Step 3: Cross multiply
   139,087.52x = 208,631.84 × 97,719.20
4. Step 4: Simplify right side
   139,087.52x = 20,387,336,499.33
5. Step 5: Solve for x
   x = 20,387,336,499.33/139,087.52
6. Step 6: Final answer
   x = 146,579.19