Finding the Fourth Proportional to 139,210.47, 208,669.20 and 88,647.93

Step by Step Solution

1. Step 1: Write the proportion equation
   139,210.47 : 208,669.20 = 88,647.93 : x
2. Step 2: Convert to fraction form
   139,210.47/208,669.20 = 88,647.93/x
3. Step 3: Cross multiply
   139,210.47x = 208,669.20 × 88,647.93
4. Step 4: Simplify right side
   139,210.47x = 18,498,092,634.76
5. Step 5: Solve for x
   x = 18,498,092,634.76/139,210.47
6. Step 6: Final answer
   x = 132,878.60