Finding the Fourth Proportional to 148,644, 205,128.72 and 81,580.32

Step by Step Solution

1. Step 1: Write the proportion equation
   148,644 : 205,128.72 = 81,580.32 : x
2. Step 2: Convert to fraction form
   148,644/205,128.72 = 81,580.32/x
3. Step 3: Cross multiply
   148,644x = 205,128.72 × 81,580.32
4. Step 4: Simplify right side
   148,644x = 16,734,466,618.79
5. Step 5: Solve for x
   x = 16,734,466,618.79/148,644
6. Step 6: Final answer
   x = 112,580.84