Finding the Fourth Proportional to 10,051.38, 13,868.10 and 7,920.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,051.38 : 13,868.10 = 7,920.30 : x
2. Step 2: Convert to fraction form
   10,051.38/13,868.10 = 7,920.30/x
3. Step 3: Cross multiply
   10,051.38x = 13,868.10 × 7,920.30
4. Step 4: Simplify right side
   10,051.38x = 109,839,512.43
5. Step 5: Solve for x
   x = 109,839,512.43/10,051.38
6. Step 6: Final answer
   x = 10,927.80