Finding the Third Proportional to 123,129 and 265,090.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,129 : 265,090.50 = 265,090.50 : x
2. Step 2: Convert to fraction form
   123,129/265,090.50 = 265,090.50/x
3. Step 3: Cross multiply
   123,129x = 265,090.50 × 265,090.50
4. Step 4: Simplify right side
   123,129x = 70,272,973,190.25
5. Step 5: Solve for x
   x = 70,272,973,190.25/123,129
6. Step 6: Final answer
   x = 570,726.42