Finding the Fourth Proportional to 77,068.50, 115,602.78 and 21,664.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,068.50 : 115,602.78 = 21,664.50 : x
2. Step 2: Convert to fraction form
   77,068.50/115,602.78 = 21,664.50/x
3. Step 3: Cross multiply
   77,068.50x = 115,602.78 × 21,664.50
4. Step 4: Simplify right side
   77,068.50x = 2,504,476,427.31
5. Step 5: Solve for x
   x = 2,504,476,427.31/77,068.50
6. Step 6: Final answer
   x = 32,496.76