Finding the Fourth Proportional to 10,521.32, 15,774.72 and 7,012.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.32 : 15,774.72 = 7,012.40 : x
2. Step 2: Convert to fraction form
   10,521.32/15,774.72 = 7,012.40/x
3. Step 3: Cross multiply
   10,521.32x = 15,774.72 × 7,012.40
4. Step 4: Simplify right side
   10,521.32x = 110,618,646.53
5. Step 5: Solve for x
   x = 110,618,646.53/10,521.32
6. Step 6: Final answer
   x = 10,513.76