Finding the Fourth Proportional to 118,418.56, 163,428.96 and 64,711.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,418.56 : 163,428.96 = 64,711.72 : x
2. Step 2: Convert to fraction form
   118,418.56/163,428.96 = 64,711.72/x
3. Step 3: Cross multiply
   118,418.56x = 163,428.96 × 64,711.72
4. Step 4: Simplify right side
   118,418.56x = 10,575,769,099.41
5. Step 5: Solve for x
   x = 10,575,769,099.41/118,418.56
6. Step 6: Final answer
   x = 89,308.37