Finding the Fourth Proportional to 89,256.42, 123,139.89 and 56,992.23

Step by Step Solution

1. Step 1: Write the proportion equation
   89,256.42 : 123,139.89 = 56,992.23 : x
2. Step 2: Convert to fraction form
   89,256.42/123,139.89 = 56,992.23/x
3. Step 3: Cross multiply
   89,256.42x = 123,139.89 × 56,992.23
4. Step 4: Simplify right side
   89,256.42x = 7,018,016,933.05
5. Step 5: Solve for x
   x = 7,018,016,933.05/89,256.42
6. Step 6: Final answer
   x = 78,627.59