Finding the Fourth Proportional to 13,880.30, 19,156.05 and 7,910.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,880.30 : 19,156.05 = 7,910.72 : x
2. Step 2: Convert to fraction form
   13,880.30/19,156.05 = 7,910.72/x
3. Step 3: Cross multiply
   13,880.30x = 19,156.05 × 7,910.72
4. Step 4: Simplify right side
   13,880.30x = 151,538,147.86
5. Step 5: Solve for x
   x = 151,538,147.86/13,880.30
6. Step 6: Final answer
   x = 10,917.50