Finding the Third Proportional to 31,128.75 and 68,798.63

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.75 : 68,798.63 = 68,798.63 : x
2. Step 2: Convert to fraction form
   31,128.75/68,798.63 = 68,798.63/x
3. Step 3: Cross multiply
   31,128.75x = 68,798.63 × 68,798.63
4. Step 4: Simplify right side
   31,128.75x = 4,733,250,801.89
5. Step 5: Solve for x
   x = 4,733,250,801.89/31,128.75
6. Step 6: Final answer
   x = 152,054.00