Finding the Fourth Proportional to 13,070.30, 18,039.65 and 7,764.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,070.30 : 18,039.65 = 7,764.09 : x
2. Step 2: Convert to fraction form
   13,070.30/18,039.65 = 7,764.09/x
3. Step 3: Cross multiply
   13,070.30x = 18,039.65 × 7,764.09
4. Step 4: Simplify right side
   13,070.30x = 140,061,427.35
5. Step 5: Solve for x
   x = 140,061,427.35/13,070.30
6. Step 6: Final answer
   x = 10,716.01