Finding the Fourth Proportional to 12,580.76, 18,858.72 and 7,038.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,580.76 : 18,858.72 = 7,038.80 : x
2. Step 2: Convert to fraction form
   12,580.76/18,858.72 = 7,038.80/x
3. Step 3: Cross multiply
   12,580.76x = 18,858.72 × 7,038.80
4. Step 4: Simplify right side
   12,580.76x = 132,742,758.34
5. Step 5: Solve for x
   x = 132,742,758.34/12,580.76
6. Step 6: Final answer
   x = 10,551.25