Finding the Fourth Proportional to 78,697.40, 108,599.25 and 42,886.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,697.40 : 108,599.25 = 42,886.64 : x
2. Step 2: Convert to fraction form
   78,697.40/108,599.25 = 42,886.64/x
3. Step 3: Cross multiply
   78,697.40x = 108,599.25 × 42,886.64
4. Step 4: Simplify right side
   78,697.40x = 4,657,456,181.59
5. Step 5: Solve for x
   x = 4,657,456,181.59/78,697.40
6. Step 6: Final answer
   x = 59,181.83