Finding the Fourth Proportional to 139,391.52, 208,970.55 and 97,147.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,391.52 : 208,970.55 = 97,147.68 : x
2. Step 2: Convert to fraction form
   139,391.52/208,970.55 = 97,147.68/x
3. Step 3: Cross multiply
   139,391.52x = 208,970.55 × 97,147.68
4. Step 4: Simplify right side
   139,391.52x = 20,301,004,120.82
5. Step 5: Solve for x
   x = 20,301,004,120.82/139,391.52
6. Step 6: Final answer
   x = 145,640.17