Finding the Fourth Proportional to 77,996.72, 116,982.66 and 21,830.78

Step by Step Solution

1. Step 1: Write the proportion equation
   77,996.72 : 116,982.66 = 21,830.78 : x
2. Step 2: Convert to fraction form
   77,996.72/116,982.66 = 21,830.78/x
3. Step 3: Cross multiply
   77,996.72x = 116,982.66 × 21,830.78
4. Step 4: Simplify right side
   77,996.72x = 2,553,822,714.27
5. Step 5: Solve for x
   x = 2,553,822,714.27/77,996.72
6. Step 6: Final answer
   x = 32,742.69