Finding the Fourth Proportional to 76,798.53, 105,978.48 and 42,810.74

Step by Step Solution

1. Step 1: Write the proportion equation
   76,798.53 : 105,978.48 = 42,810.74 : x
2. Step 2: Convert to fraction form
   76,798.53/105,978.48 = 42,810.74/x
3. Step 3: Cross multiply
   76,798.53x = 105,978.48 × 42,810.74
4. Step 4: Simplify right side
   76,798.53x = 4,537,016,622.98
5. Step 5: Solve for x
   x = 4,537,016,622.98/76,798.53
6. Step 6: Final answer
   x = 59,076.87