Finding the Fourth Proportional to 123,788.16, 170,831.16 and 72,804.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,788.16 : 170,831.16 = 72,804.60 : x
2. Step 2: Convert to fraction form
   123,788.16/170,831.16 = 72,804.60/x
3. Step 3: Cross multiply
   123,788.16x = 170,831.16 × 72,804.60
4. Step 4: Simplify right side
   123,788.16x = 12,437,294,271.34
5. Step 5: Solve for x
   x = 12,437,294,271.34/123,788.16
6. Step 6: Final answer
   x = 100,472.41