Finding the Fourth Proportional to 149,843.70, 206,784.72 and 81,861.30

Step by Step Solution

1. Step 1: Write the proportion equation
   149,843.70 : 206,784.72 = 81,861.30 : x
2. Step 2: Convert to fraction form
   149,843.70/206,784.72 = 81,861.30/x
3. Step 3: Cross multiply
   149,843.70x = 206,784.72 × 81,861.30
4. Step 4: Simplify right side
   149,843.70x = 16,927,665,999.34
5. Step 5: Solve for x
   x = 16,927,665,999.34/149,843.70
6. Step 6: Final answer
   x = 112,968.82