Finding the Fourth Proportional to 77,100.50, 115,650.78 and 21,696.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,100.50 : 115,650.78 = 21,696.50 : x
2. Step 2: Convert to fraction form
   77,100.50/115,650.78 = 21,696.50/x
3. Step 3: Cross multiply
   77,100.50x = 115,650.78 × 21,696.50
4. Step 4: Simplify right side
   77,100.50x = 2,509,217,148.27
5. Step 5: Solve for x
   x = 2,509,217,148.27/77,100.50
6. Step 6: Final answer
   x = 32,544.76