Finding the Third Proportional to 90,402.19 and 136,423.69

Step by Step Solution

1. Step 1: Write the proportion equation
   90,402.19 : 136,423.69 = 136,423.69 : x
2. Step 2: Convert to fraction form
   90,402.19/136,423.69 = 136,423.69/x
3. Step 3: Cross multiply
   90,402.19x = 136,423.69 × 136,423.69
4. Step 4: Simplify right side
   90,402.19x = 18,611,422,511.10
5. Step 5: Solve for x
   x = 18,611,422,511.10/90,402.19
6. Step 6: Final answer
   x = 205,873.59