Finding the Fourth Proportional to 13,056.81, 19,571.80 and 5,156.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,056.81 : 19,571.80 = 5,156.12 : x
2. Step 2: Convert to fraction form
   13,056.81/19,571.80 = 5,156.12/x
3. Step 3: Cross multiply
   13,056.81x = 19,571.80 × 5,156.12
4. Step 4: Simplify right side
   13,056.81x = 100,914,552.32
5. Step 5: Solve for x
   x = 100,914,552.32/13,056.81
6. Step 6: Final answer
   x = 7,728.88