Finding the Fourth Proportional to 105,445.59, 145,514.52 and 57,047.64

Step by Step Solution

1. Step 1: Write the proportion equation
   105,445.59 : 145,514.52 = 57,047.64 : x
2. Step 2: Convert to fraction form
   105,445.59/145,514.52 = 57,047.64/x
3. Step 3: Cross multiply
   105,445.59x = 145,514.52 × 57,047.64
4. Step 4: Simplify right side
   105,445.59x = 8,301,259,904.55
5. Step 5: Solve for x
   x = 8,301,259,904.55/105,445.59
6. Step 6: Final answer
   x = 78,725.53