Finding the Third Proportional to 91,390.78 and 213,532.88

Step by Step Solution

1. Step 1: Write the proportion equation
   91,390.78 : 213,532.88 = 213,532.88 : x
2. Step 2: Convert to fraction form
   91,390.78/213,532.88 = 213,532.88/x
3. Step 3: Cross multiply
   91,390.78x = 213,532.88 × 213,532.88
4. Step 4: Simplify right side
   91,390.78x = 45,596,288,705.77
5. Step 5: Solve for x
   x = 45,596,288,705.77/91,390.78
6. Step 6: Final answer
   x = 498,915.62