Finding the Fourth Proportional to 13,889.42, 19,164.71 and 7,920.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,889.42 : 19,164.71 = 7,920.93 : x
2. Step 2: Convert to fraction form
   13,889.42/19,164.71 = 7,920.93/x
3. Step 3: Cross multiply
   13,889.42x = 19,164.71 × 7,920.93
4. Step 4: Simplify right side
   13,889.42x = 151,802,286.78
5. Step 5: Solve for x
   x = 151,802,286.78/13,889.42
6. Step 6: Final answer
   x = 10,929.35