Finding the Fourth Proportional to 118,400.01, 163,391.41 and 64,688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   118,400.01 : 163,391.41 = 64,688.10 : x
2. Step 2: Convert to fraction form
   118,400.01/163,391.41 = 64,688.10/x
3. Step 3: Cross multiply
   118,400.01x = 163,391.41 × 64,688.10
4. Step 4: Simplify right side
   118,400.01x = 10,569,479,869.22
5. Step 5: Solve for x
   x = 10,569,479,869.22/118,400.01
6. Step 6: Final answer
   x = 89,269.25