Finding the Fourth Proportional to 151,055.16, 208,466.31 and 99,979.91

Step by Step Solution

1. Step 1: Write the proportion equation
   151,055.16 : 208,466.31 = 99,979.91 : x
2. Step 2: Convert to fraction form
   151,055.16/208,466.31 = 99,979.91/x
3. Step 3: Cross multiply
   151,055.16x = 208,466.31 × 99,979.91
4. Step 4: Simplify right side
   151,055.16x = 20,842,441,869.50
5. Step 5: Solve for x
   x = 20,842,441,869.50/151,055.16
6. Step 6: Final answer
   x = 137,979.01