Finding the Third Proportional to 13,387.78 and 19,690.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,387.78 : 19,690.59 = 19,690.59 : x
2. Step 2: Convert to fraction form
   13,387.78/19,690.59 = 19,690.59/x
3. Step 3: Cross multiply
   13,387.78x = 19,690.59 × 19,690.59
4. Step 4: Simplify right side
   13,387.78x = 387,719,482.23
5. Step 5: Solve for x
   x = 387,719,482.23/13,387.78
6. Step 6: Final answer
   x = 28,960.70