Finding the Fourth Proportional to 64,828.07, 89,259.15 and 55,118.43

Step by Step Solution

1. Step 1: Write the proportion equation
   64,828.07 : 89,259.15 = 55,118.43 : x
2. Step 2: Convert to fraction form
   64,828.07/89,259.15 = 55,118.43/x
3. Step 3: Cross multiply
   64,828.07x = 89,259.15 × 55,118.43
4. Step 4: Simplify right side
   64,828.07x = 4,919,824,211.13
5. Step 5: Solve for x
   x = 4,919,824,211.13/64,828.07
6. Step 6: Final answer
   x = 75,890.34