Finding the Fourth Proportional to 13,258.62, 19,870.28 and 7,017.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,258.62 : 19,870.28 = 7,017.30 : x
2. Step 2: Convert to fraction form
   13,258.62/19,870.28 = 7,017.30/x
3. Step 3: Cross multiply
   13,258.62x = 19,870.28 × 7,017.30
4. Step 4: Simplify right side
   13,258.62x = 139,435,715.84
5. Step 5: Solve for x
   x = 139,435,715.84/13,258.62
6. Step 6: Final answer
   x = 10,516.61