Finding the Fourth Proportional to 76,798.57, 105,969.15 and 42,799.60

Step by Step Solution

1. Step 1: Write the proportion equation
   76,798.57 : 105,969.15 = 42,799.60 : x
2. Step 2: Convert to fraction form
   76,798.57/105,969.15 = 42,799.60/x
3. Step 3: Cross multiply
   76,798.57x = 105,969.15 × 42,799.60
4. Step 4: Simplify right side
   76,798.57x = 4,535,437,232.34
5. Step 5: Solve for x
   x = 4,535,437,232.34/76,798.57
6. Step 6: Final answer
   x = 59,056.27