Finding the Fourth Proportional to 151,061.16, 208,474.59 and 99,985.89

Step by Step Solution

1. Step 1: Write the proportion equation
   151,061.16 : 208,474.59 = 99,985.89 : x
2. Step 2: Convert to fraction form
   151,061.16/208,474.59 = 99,985.89/x
3. Step 3: Cross multiply
   151,061.16x = 208,474.59 × 99,985.89
4. Step 4: Simplify right side
   151,061.16x = 20,844,517,423.54
5. Step 5: Solve for x
   x = 20,844,517,423.54/151,061.16
6. Step 6: Final answer
   x = 137,987.27