Finding the Third Proportional to 57,358 and 86,061

Step by Step Solution

1. Step 1: Write the proportion equation
   57,358 : 86,061 = 86,061 : x
2. Step 2: Convert to fraction form
   57,358/86,061 = 86,061/x
3. Step 3: Cross multiply
   57,358x = 86,061 × 86,061
4. Step 4: Simplify right side
   57,358x = 7,406,495,721
5. Step 5: Solve for x
   x = 7,406,495,721/57,358
6. Step 6: Final answer
   x = 129,127.51