Finding the Fourth Proportional to 62,640, 86,488.56 and 40,322.88

Step by Step Solution

1. Step 1: Write the proportion equation
   62,640 : 86,488.56 = 40,322.88 : x
2. Step 2: Convert to fraction form
   62,640/86,488.56 = 40,322.88/x
3. Step 3: Cross multiply
   62,640x = 86,488.56 × 40,322.88
4. Step 4: Simplify right side
   62,640x = 3,487,467,826.25
5. Step 5: Solve for x
   x = 3,487,467,826.25/62,640
6. Step 6: Final answer
   x = 55,674.77