Finding the Fourth Proportional to 89,652, 123,678.21 and 57,831.15

Step by Step Solution

1. Step 1: Write the proportion equation
   89,652 : 123,678.21 = 57,831.15 : x
2. Step 2: Convert to fraction form
   89,652/123,678.21 = 57,831.15/x
3. Step 3: Cross multiply
   89,652x = 123,678.21 × 57,831.15
4. Step 4: Simplify right side
   89,652x = 7,152,453,114.24
5. Step 5: Solve for x
   x = 7,152,453,114.24/89,652
6. Step 6: Final answer
   x = 79,780.18