Finding the Fourth Proportional to 25,435.50, 35,100.99 and 15,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   25,435.50 : 35,100.99 = 15,499.50 : x
2. Step 2: Convert to fraction form
   25,435.50/35,100.99 = 15,499.50/x
3. Step 3: Cross multiply
   25,435.50x = 35,100.99 × 15,499.50
4. Step 4: Simplify right side
   25,435.50x = 544,047,794.51
5. Step 5: Solve for x
   x = 544,047,794.51/25,435.50
6. Step 6: Final answer
   x = 21,389.31