Finding the Fourth Proportional to 13,180.68, 19,773.78 and 5,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,180.68 : 19,773.78 = 5,389.50 : x
2. Step 2: Convert to fraction form
   13,180.68/19,773.78 = 5,389.50/x
3. Step 3: Cross multiply
   13,180.68x = 19,773.78 × 5,389.50
4. Step 4: Simplify right side
   13,180.68x = 106,570,787.31
5. Step 5: Solve for x
   x = 106,570,787.31/13,180.68
6. Step 6: Final answer
   x = 8,085.38