Finding the Fourth Proportional to 76,133.70, 105,061.86 and 42,142.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,133.70 : 105,061.86 = 42,142.05 : x
2. Step 2: Convert to fraction form
   76,133.70/105,061.86 = 42,142.05/x
3. Step 3: Cross multiply
   76,133.70x = 105,061.86 × 42,142.05
4. Step 4: Simplify right side
   76,133.70x = 4,427,522,157.21
5. Step 5: Solve for x
   x = 4,427,522,157.21/76,133.70
6. Step 6: Final answer
   x = 58,154.56