Finding the Third Proportional to 26,490 and 56,139

Step by Step Solution

1. Step 1: Write the proportion equation
   26,490 : 56,139 = 56,139 : x
2. Step 2: Convert to fraction form
   26,490/56,139 = 56,139/x
3. Step 3: Cross multiply
   26,490x = 56,139 × 56,139
4. Step 4: Simplify right side
   26,490x = 3,151,587,321
5. Step 5: Solve for x
   x = 3,151,587,321/26,490
6. Step 6: Final answer
   x = 118,972.72