Finding the Fourth Proportional to 13,781.56, 19,018.98 and 7,813

Step by Step Solution

1. Step 1: Write the proportion equation
   13,781.56 : 19,018.98 = 7,813 : x
2. Step 2: Convert to fraction form
   13,781.56/19,018.98 = 7,813/x
3. Step 3: Cross multiply
   13,781.56x = 19,018.98 × 7,813
4. Step 4: Simplify right side
   13,781.56x = 148,595,290.74
5. Step 5: Solve for x
   x = 148,595,290.74/13,781.56
6. Step 6: Final answer
   x = 10,782.18