Finding the Fourth Proportional to 13,054.79, 18,015.62 and 7,086.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,054.79 : 18,015.62 = 7,086.45 : x
2. Step 2: Convert to fraction form
   13,054.79/18,015.62 = 7,086.45/x
3. Step 3: Cross multiply
   13,054.79x = 18,015.62 × 7,086.45
4. Step 4: Simplify right side
   13,054.79x = 127,666,822.48
5. Step 5: Solve for x
   x = 127,666,822.48/13,054.79
6. Step 6: Final answer
   x = 9,779.31