Finding the Fourth Proportional to 42,856.64, 59,138.76 and 23,991.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,856.64 : 59,138.76 = 23,991.20 : x
2. Step 2: Convert to fraction form
   42,856.64/59,138.76 = 23,991.20/x
3. Step 3: Cross multiply
   42,856.64x = 59,138.76 × 23,991.20
4. Step 4: Simplify right side
   42,856.64x = 1,418,809,818.91
5. Step 5: Solve for x
   x = 1,418,809,818.91/42,856.64
6. Step 6: Final answer
   x = 33,105.95