Finding the Fourth Proportional to 76,521.78, 114,789.27 and 21,117.78

Step by Step Solution

1. Step 1: Write the proportion equation
   76,521.78 : 114,789.27 = 21,117.78 : x
2. Step 2: Convert to fraction form
   76,521.78/114,789.27 = 21,117.78/x
3. Step 3: Cross multiply
   76,521.78x = 114,789.27 × 21,117.78
4. Step 4: Simplify right side
   76,521.78x = 2,424,094,550.22
5. Step 5: Solve for x
   x = 2,424,094,550.22/76,521.78
6. Step 6: Final answer
   x = 31,678.49