Finding the Fourth Proportional to 148,128.18, 204,204.24 and 105,612.90

Step by Step Solution

1. Step 1: Write the proportion equation
   148,128.18 : 204,204.24 = 105,612.90 : x
2. Step 2: Convert to fraction form
   148,128.18/204,204.24 = 105,612.90/x
3. Step 3: Cross multiply
   148,128.18x = 204,204.24 × 105,612.90
4. Step 4: Simplify right side
   148,128.18x = 21,566,601,978.70
5. Step 5: Solve for x
   x = 21,566,601,978.70/148,128.18
6. Step 6: Final answer
   x = 145,594.19