Finding the Fourth Proportional to 139,127.12, 208,689.72 and 97,758.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,127.12 : 208,689.72 = 97,758.80 : x
2. Step 2: Convert to fraction form
   139,127.12/208,689.72 = 97,758.80/x
3. Step 3: Cross multiply
   139,127.12x = 208,689.72 × 97,758.80
4. Step 4: Simplify right side
   139,127.12x = 20,401,256,599.54
5. Step 5: Solve for x
   x = 20,401,256,599.54/139,127.12
6. Step 6: Final answer
   x = 146,637.53