Finding the Fourth Proportional to 77,991.61, 116,982.78 and 21,830.47

Step by Step Solution

1. Step 1: Write the proportion equation
   77,991.61 : 116,982.78 = 21,830.47 : x
2. Step 2: Convert to fraction form
   77,991.61/116,982.78 = 21,830.47/x
3. Step 3: Cross multiply
   77,991.61x = 116,982.78 × 21,830.47
4. Step 4: Simplify right side
   77,991.61x = 2,553,789,069.31
5. Step 5: Solve for x
   x = 2,553,789,069.31/77,991.61
6. Step 6: Final answer
   x = 32,744.41