Finding the Third Proportional to 61,448.63 and 91,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   61,448.63 : 91,990.69 = 91,990.69 : x
2. Step 2: Convert to fraction form
   61,448.63/91,990.69 = 91,990.69/x
3. Step 3: Cross multiply
   61,448.63x = 91,990.69 × 91,990.69
4. Step 4: Simplify right side
   61,448.63x = 8,462,286,586.72
5. Step 5: Solve for x
   x = 8,462,286,586.72/61,448.63
6. Step 6: Final answer
   x = 137,713.20