Finding the Fourth Proportional to 13,066.68, 18,019.72 and 10,077.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,066.68 : 18,019.72 = 10,077.78 : x
2. Step 2: Convert to fraction form
   13,066.68/18,019.72 = 10,077.78/x
3. Step 3: Cross multiply
   13,066.68x = 18,019.72 × 10,077.78
4. Step 4: Simplify right side
   13,066.68x = 181,598,773.82
5. Step 5: Solve for x
   x = 181,598,773.82/13,066.68
6. Step 6: Final answer
   x = 13,897.85