Finding the Fourth Proportional to 13,445.91, 18,552.30 and 7,780.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,445.91 : 18,552.30 = 7,780.52 : x
2. Step 2: Convert to fraction form
   13,445.91/18,552.30 = 7,780.52/x
3. Step 3: Cross multiply
   13,445.91x = 18,552.30 × 7,780.52
4. Step 4: Simplify right side
   13,445.91x = 144,346,448.43
5. Step 5: Solve for x
   x = 144,346,448.43/13,445.91
6. Step 6: Final answer
   x = 10,735.34