Finding the Third Proportional to 99,681.89 and 215,971.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,681.89 : 215,971.31 = 215,971.31 : x
2. Step 2: Convert to fraction form
   99,681.89/215,971.31 = 215,971.31/x
3. Step 3: Cross multiply
   99,681.89x = 215,971.31 × 215,971.31
4. Step 4: Simplify right side
   99,681.89x = 46,643,607,822.97
5. Step 5: Solve for x
   x = 46,643,607,822.97/99,681.89
6. Step 6: Final answer
   x = 467,924.59