Finding the Fourth Proportional to 13,820.46, 19,072.29 and 7,854.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,820.46 : 19,072.29 = 7,854.12 : x
2. Step 2: Convert to fraction form
   13,820.46/19,072.29 = 7,854.12/x
3. Step 3: Cross multiply
   13,820.46x = 19,072.29 × 7,854.12
4. Step 4: Simplify right side
   13,820.46x = 149,796,054.33
5. Step 5: Solve for x
   x = 149,796,054.33/13,820.46
6. Step 6: Final answer
   x = 10,838.72