Finding the Fourth Proportional to 64,928.68, 89,648.58 and 42,637.48

Step by Step Solution

1. Step 1: Write the proportion equation
   64,928.68 : 89,648.58 = 42,637.48 : x
2. Step 2: Convert to fraction form
   64,928.68/89,648.58 = 42,637.48/x
3. Step 3: Cross multiply
   64,928.68x = 89,648.58 × 42,637.48
4. Step 4: Simplify right side
   64,928.68x = 3,822,389,536.78
5. Step 5: Solve for x
   x = 3,822,389,536.78/64,928.68
6. Step 6: Final answer
   x = 58,870.59