Finding the Fourth Proportional to 76,109.31, 105,028.70 and 42,119.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,109.31 : 105,028.70 = 42,119.21 : x
2. Step 2: Convert to fraction form
   76,109.31/105,028.70 = 42,119.21/x
3. Step 3: Cross multiply
   76,109.31x = 105,028.70 × 42,119.21
4. Step 4: Simplify right side
   76,109.31x = 4,423,725,135.59
5. Step 5: Solve for x
   x = 4,423,725,135.59/76,109.31
6. Step 6: Final answer
   x = 58,123.31