Finding the Fourth Proportional to 64,887.93, 89,504.00 and 57,211.56

Step by Step Solution

1. Step 1: Write the proportion equation
   64,887.93 : 89,504.00 = 57,211.56 : x
2. Step 2: Convert to fraction form
   64,887.93/89,504.00 = 57,211.56/x
3. Step 3: Cross multiply
   64,887.93x = 89,504.00 × 57,211.56
4. Step 4: Simplify right side
   64,887.93x = 5,120,663,180.18
5. Step 5: Solve for x
   x = 5,120,663,180.18/64,887.93
6. Step 6: Final answer
   x = 78,915.50