Finding the Fourth Proportional to 62,820.28, 86,697.32 and 42,721.76

Step by Step Solution

1. Step 1: Write the proportion equation
   62,820.28 : 86,697.32 = 42,721.76 : x
2. Step 2: Convert to fraction form
   62,820.28/86,697.32 = 42,721.76/x
3. Step 3: Cross multiply
   62,820.28x = 86,697.32 × 42,721.76
4. Step 4: Simplify right side
   62,820.28x = 3,703,862,097.68
5. Step 5: Solve for x
   x = 3,703,862,097.68/62,820.28
6. Step 6: Final answer
   x = 58,959.66