Finding the Fourth Proportional to 13,820.72, 19,072.52 and 7,851.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,820.72 : 19,072.52 = 7,851.20 : x
2. Step 2: Convert to fraction form
   13,820.72/19,072.52 = 7,851.20/x
3. Step 3: Cross multiply
   13,820.72x = 19,072.52 × 7,851.20
4. Step 4: Simplify right side
   13,820.72x = 149,742,169.02
5. Step 5: Solve for x
   x = 149,742,169.02/13,820.72
6. Step 6: Final answer
   x = 10,834.61