Finding the Fourth Proportional to 64,683.30, 89,214.84 and 57,116.28

Step by Step Solution

1. Step 1: Write the proportion equation
   64,683.30 : 89,214.84 = 57,116.28 : x
2. Step 2: Convert to fraction form
   64,683.30/89,214.84 = 57,116.28/x
3. Step 3: Cross multiply
   64,683.30x = 89,214.84 × 57,116.28
4. Step 4: Simplify right side
   64,683.30x = 5,095,619,781.60
5. Step 5: Solve for x
   x = 5,095,619,781.60/64,683.30
6. Step 6: Final answer
   x = 78,777.98