Finding the Fourth Proportional to 139,391.02, 208,969.80 and 97,147.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,391.02 : 208,969.80 = 97,147.18 : x
2. Step 2: Convert to fraction form
   139,391.02/208,969.80 = 97,147.18/x
3. Step 3: Cross multiply
   139,391.02x = 208,969.80 × 97,147.18
4. Step 4: Simplify right side
   139,391.02x = 20,300,826,775.16
5. Step 5: Solve for x
   x = 20,300,826,775.16/139,391.02
6. Step 6: Final answer
   x = 145,639.42