Finding the Fourth Proportional to 76,117.40, 105,042.20 and 42,128.22

Step by Step Solution

1. Step 1: Write the proportion equation
   76,117.40 : 105,042.20 = 42,128.22 : x
2. Step 2: Convert to fraction form
   76,117.40/105,042.20 = 42,128.22/x
3. Step 3: Cross multiply
   76,117.40x = 105,042.20 × 42,128.22
4. Step 4: Simplify right side
   76,117.40x = 4,425,240,700.24
5. Step 5: Solve for x
   x = 4,425,240,700.24/76,117.40
6. Step 6: Final answer
   x = 58,137.05