Finding the Fourth Proportional to 112,978.71, 155,915.49 and 67,664.07

Step by Step Solution

1. Step 1: Write the proportion equation
   112,978.71 : 155,915.49 = 67,664.07 : x
2. Step 2: Convert to fraction form
   112,978.71/155,915.49 = 67,664.07/x
3. Step 3: Cross multiply
   112,978.71x = 155,915.49 × 67,664.07
4. Step 4: Simplify right side
   112,978.71x = 10,549,876,629.44
5. Step 5: Solve for x
   x = 10,549,876,629.44/112,978.71
6. Step 6: Final answer
   x = 93,379.33