Finding the Fourth Proportional to 76,312.71, 105,311.21 and 42,778.71

Step by Step Solution

1. Step 1: Write the proportion equation
   76,312.71 : 105,311.21 = 42,778.71 : x
2. Step 2: Convert to fraction form
   76,312.71/105,311.21 = 42,778.71/x
3. Step 3: Cross multiply
   76,312.71x = 105,311.21 × 42,778.71
4. Step 4: Simplify right side
   76,312.71x = 4,505,077,498.45
5. Step 5: Solve for x
   x = 4,505,077,498.45/76,312.71
6. Step 6: Final answer
   x = 59,034.43