Finding the Third Proportional to 61,158 and 86,123.63

Step by Step Solution

1. Step 1: Write the proportion equation
   61,158 : 86,123.63 = 86,123.63 : x
2. Step 2: Convert to fraction form
   61,158/86,123.63 = 86,123.63/x
3. Step 3: Cross multiply
   61,158x = 86,123.63 × 86,123.63
4. Step 4: Simplify right side
   61,158x = 7,417,278,783.14
5. Step 5: Solve for x
   x = 7,417,278,783.14/61,158
6. Step 6: Final answer
   x = 121,280.60