Finding the Fourth Proportional to 76,803.34, 105,978.15 and 42,807.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,803.34 : 105,978.15 = 42,807.79 : x
2. Step 2: Convert to fraction form
   76,803.34/105,978.15 = 42,807.79/x
3. Step 3: Cross multiply
   76,803.34x = 105,978.15 × 42,807.79
4. Step 4: Simplify right side
   76,803.34x = 4,536,690,401.86
5. Step 5: Solve for x
   x = 4,536,690,401.86/76,803.34
6. Step 6: Final answer
   x = 59,068.92