Finding the Fourth Proportional to 89,865.63, 123,992.42 and 54,931.47

Step by Step Solution

1. Step 1: Write the proportion equation
   89,865.63 : 123,992.42 = 54,931.47 : x
2. Step 2: Convert to fraction form
   89,865.63/123,992.42 = 54,931.47/x
3. Step 3: Cross multiply
   89,865.63x = 123,992.42 × 54,931.47
4. Step 4: Simplify right side
   89,865.63x = 6,811,085,159.83
5. Step 5: Solve for x
   x = 6,811,085,159.83/89,865.63
6. Step 6: Final answer
   x = 75,791.88