Finding the Third Proportional to 28,678.78 and 61,972.59

Step by Step Solution

1. Step 1: Write the proportion equation
   28,678.78 : 61,972.59 = 61,972.59 : x
2. Step 2: Convert to fraction form
   28,678.78/61,972.59 = 61,972.59/x
3. Step 3: Cross multiply
   28,678.78x = 61,972.59 × 61,972.59
4. Step 4: Simplify right side
   28,678.78x = 3,840,602,376.10
5. Step 5: Solve for x
   x = 3,840,602,376.10/28,678.78
6. Step 6: Final answer
   x = 133,917.91