Finding the Fourth Proportional to 151,139.59, 208,574.40 and 86,607.55

Step by Step Solution

1. Step 1: Write the proportion equation
   151,139.59 : 208,574.40 = 86,607.55 : x
2. Step 2: Convert to fraction form
   151,139.59/208,574.40 = 86,607.55/x
3. Step 3: Cross multiply
   151,139.59x = 208,574.40 × 86,607.55
4. Step 4: Simplify right side
   151,139.59x = 18,064,117,776.72
5. Step 5: Solve for x
   x = 18,064,117,776.72/151,139.59
6. Step 6: Final answer
   x = 119,519.43