Finding the Third Proportional to 61,072.31 and 89,420.63

Step by Step Solution

1. Step 1: Write the proportion equation
   61,072.31 : 89,420.63 = 89,420.63 : x
2. Step 2: Convert to fraction form
   61,072.31/89,420.63 = 89,420.63/x
3. Step 3: Cross multiply
   61,072.31x = 89,420.63 × 89,420.63
4. Step 4: Simplify right side
   61,072.31x = 7,996,048,175.39
5. Step 5: Solve for x
   x = 7,996,048,175.39/61,072.31
6. Step 6: Final answer
   x = 130,927.55