Finding the Fourth Proportional to 13,752.37, 18,978.55 and 7,784.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,752.37 : 18,978.55 = 7,784.03 : x
2. Step 2: Convert to fraction form
   13,752.37/18,978.55 = 7,784.03/x
3. Step 3: Cross multiply
   13,752.37x = 18,978.55 × 7,784.03
4. Step 4: Simplify right side
   13,752.37x = 147,729,602.56
5. Step 5: Solve for x
   x = 147,729,602.56/13,752.37
6. Step 6: Final answer
   x = 10,742.12