Finding the Fourth Proportional to 76,799.57, 105,970.53 and 42,800.60

Step by Step Solution

1. Step 1: Write the proportion equation
   76,799.57 : 105,970.53 = 42,800.60 : x
2. Step 2: Convert to fraction form
   76,799.57/105,970.53 = 42,800.60/x
3. Step 3: Cross multiply
   76,799.57x = 105,970.53 × 42,800.60
4. Step 4: Simplify right side
   76,799.57x = 4,535,602,266.32
5. Step 5: Solve for x
   x = 4,535,602,266.32/76,799.57
6. Step 6: Final answer
   x = 59,057.65