Finding the Fourth Proportional to 123,291.05, 169,986.74 and 100,607.00

Step by Step Solution

1. Step 1: Write the proportion equation
   123,291.05 : 169,986.74 = 100,607.00 : x
2. Step 2: Convert to fraction form
   123,291.05/169,986.74 = 100,607.00/x
3. Step 3: Cross multiply
   123,291.05x = 169,986.74 × 100,607.00
4. Step 4: Simplify right side
   123,291.05x = 17,101,854,598.21
5. Step 5: Solve for x
   x = 17,101,854,598.21/123,291.05
6. Step 6: Final answer
   x = 138,711.25