Finding the Fourth Proportional to 12,780.81, 17,637.50 and 7,474.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.81 : 17,637.50 = 7,474.53 : x
2. Step 2: Convert to fraction form
   12,780.81/17,637.50 = 7,474.53/x
3. Step 3: Cross multiply
   12,780.81x = 17,637.50 × 7,474.53
4. Step 4: Simplify right side
   12,780.81x = 131,831,985.50
5. Step 5: Solve for x
   x = 131,831,985.50/12,780.81
6. Step 6: Final answer
   x = 10,314.84