Finding the Fourth Proportional to 76,122, 105,046.90 and 42,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,122 : 105,046.90 = 42,130.50 : x
2. Step 2: Convert to fraction form
   76,122/105,046.90 = 42,130.50/x
3. Step 3: Cross multiply
   76,122x = 105,046.90 × 42,130.50
4. Step 4: Simplify right side
   76,122x = 4,425,678,420.45
5. Step 5: Solve for x
   x = 4,425,678,420.45/76,122
6. Step 6: Final answer
   x = 58,139.28