Finding the Fourth Proportional to 13,905.34, 19,191.19 and 7,938.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,905.34 : 19,191.19 = 7,938.17 : x
2. Step 2: Convert to fraction form
   13,905.34/19,191.19 = 7,938.17/x
3. Step 3: Cross multiply
   13,905.34x = 19,191.19 × 7,938.17
4. Step 4: Simplify right side
   13,905.34x = 152,342,928.72
5. Step 5: Solve for x
   x = 152,342,928.72/13,905.34
6. Step 6: Final answer
   x = 10,955.71