Finding the Fourth Proportional to 78,709.41, 108,618.03 and 42,899.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,709.41 : 108,618.03 = 42,899.31 : x
2. Step 2: Convert to fraction form
   78,709.41/108,618.03 = 42,899.31/x
3. Step 3: Cross multiply
   78,709.41x = 108,618.03 × 42,899.31
4. Step 4: Simplify right side
   78,709.41x = 4,659,638,540.56
5. Step 5: Solve for x
   x = 4,659,638,540.56/78,709.41
6. Step 6: Final answer
   x = 59,200.53