Finding the Fourth Proportional to 64,637.32, 89,178.06 and 52,680.10

Step by Step Solution

1. Step 1: Write the proportion equation
   64,637.32 : 89,178.06 = 52,680.10 : x
2. Step 2: Convert to fraction form
   64,637.32/89,178.06 = 52,680.10/x
3. Step 3: Cross multiply
   64,637.32x = 89,178.06 × 52,680.10
4. Step 4: Simplify right side
   64,637.32x = 4,697,909,118.61
5. Step 5: Solve for x
   x = 4,697,909,118.61/64,637.32
6. Step 6: Final answer
   x = 72,681.06