Finding the Fourth Proportional to 76,505.30, 105,575.20 and 42,512.91

Step by Step Solution

1. Step 1: Write the proportion equation
   76,505.30 : 105,575.20 = 42,512.91 : x
2. Step 2: Convert to fraction form
   76,505.30/105,575.20 = 42,512.91/x
3. Step 3: Cross multiply
   76,505.30x = 105,575.20 × 42,512.91
4. Step 4: Simplify right side
   76,505.30x = 4,488,308,975.83
5. Step 5: Solve for x
   x = 4,488,308,975.83/76,505.30
6. Step 6: Final answer
   x = 58,666.64