Finding the Fourth Proportional to 10,019.70, 13,885.56 and 9,878.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,019.70 : 13,885.56 = 9,878.76 : x
2. Step 2: Convert to fraction form
   10,019.70/13,885.56 = 9,878.76/x
3. Step 3: Cross multiply
   10,019.70x = 13,885.56 × 9,878.76
4. Step 4: Simplify right side
   10,019.70x = 137,172,114.71
5. Step 5: Solve for x
   x = 137,172,114.71/10,019.70
6. Step 6: Final answer
   x = 13,690.24