Finding the Fourth Proportional to 66,801.48, 91,976.22 and 56,709

Step by Step Solution

1. Step 1: Write the proportion equation
   66,801.48 : 91,976.22 = 56,709 : x
2. Step 2: Convert to fraction form
   66,801.48/91,976.22 = 56,709/x
3. Step 3: Cross multiply
   66,801.48x = 91,976.22 × 56,709
4. Step 4: Simplify right side
   66,801.48x = 5,215,879,459.98
5. Step 5: Solve for x
   x = 5,215,879,459.98/66,801.48
6. Step 6: Final answer
   x = 78,080.30