Finding the Fourth Proportional to 64,978.88, 97,389.78 and 31,649

Step by Step Solution

1. Step 1: Write the proportion equation
   64,978.88 : 97,389.78 = 31,649 : x
2. Step 2: Convert to fraction form
   64,978.88/97,389.78 = 31,649/x
3. Step 3: Cross multiply
   64,978.88x = 97,389.78 × 31,649
4. Step 4: Simplify right side
   64,978.88x = 3,082,289,147.22
5. Step 5: Solve for x
   x = 3,082,289,147.22/64,978.88
6. Step 6: Final answer
   x = 47,435.25