Finding the Fourth Proportional to 118,139.68, 163,032.79 and 64,423.31

Step by Step Solution

1. Step 1: Write the proportion equation
   118,139.68 : 163,032.79 = 64,423.31 : x
2. Step 2: Convert to fraction form
   118,139.68/163,032.79 = 64,423.31/x
3. Step 3: Cross multiply
   118,139.68x = 163,032.79 × 64,423.31
4. Step 4: Simplify right side
   118,139.68x = 10,503,111,970.33
5. Step 5: Solve for x
   x = 10,503,111,970.33/118,139.68
6. Step 6: Final answer
   x = 88,904.19