Finding the Fourth Proportional to 19,907.32, 27,499.96 and 18,111.60

Step by Step Solution

1. Step 1: Write the proportion equation
   19,907.32 : 27,499.96 = 18,111.60 : x
2. Step 2: Convert to fraction form
   19,907.32/27,499.96 = 18,111.60/x
3. Step 3: Cross multiply
   19,907.32x = 27,499.96 × 18,111.60
4. Step 4: Simplify right side
   19,907.32x = 498,068,196.30
5. Step 5: Solve for x
   x = 498,068,196.30/19,907.32
6. Step 6: Final answer
   x = 25,019.35