Finding the Fourth Proportional to 149,142.79, 205,821.37 and 81,164.15

Step by Step Solution

1. Step 1: Write the proportion equation
   149,142.79 : 205,821.37 = 81,164.15 : x
2. Step 2: Convert to fraction form
   149,142.79/205,821.37 = 81,164.15/x
3. Step 3: Cross multiply
   149,142.79x = 205,821.37 × 81,164.15
4. Step 4: Simplify right side
   149,142.79x = 16,705,316,547.89
5. Step 5: Solve for x
   x = 16,705,316,547.89/149,142.79
6. Step 6: Final answer
   x = 112,008.88