Finding the Fourth Proportional to 76,798.77, 105,980.69 and 42,807.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76,798.77 : 105,980.69 = 42,807.12 : x
2. Step 2: Convert to fraction form
   76,798.77/105,980.69 = 42,807.12/x
3. Step 3: Cross multiply
   76,798.77x = 105,980.69 × 42,807.12
4. Step 4: Simplify right side
   76,798.77x = 4,536,727,900.48
5. Step 5: Solve for x
   x = 4,536,727,900.48/76,798.77
6. Step 6: Final answer
   x = 59,072.92