Finding the Fourth Proportional to 118,420.56, 163,431.72 and 64,713.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,420.56 : 163,431.72 = 64,713.72 : x
2. Step 2: Convert to fraction form
   118,420.56/163,431.72 = 64,713.72/x
3. Step 3: Cross multiply
   118,420.56x = 163,431.72 × 64,713.72
4. Step 4: Simplify right side
   118,420.56x = 10,576,274,567.20
5. Step 5: Solve for x
   x = 10,576,274,567.20/118,420.56
6. Step 6: Final answer
   x = 89,311.13