Finding the Fourth Proportional to 12,920.36, 19,381.01 and 3,561.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.36 : 19,381.01 = 3,561.12 : x
2. Step 2: Convert to fraction form
   12,920.36/19,381.01 = 3,561.12/x
3. Step 3: Cross multiply
   12,920.36x = 19,381.01 × 3,561.12
4. Step 4: Simplify right side
   12,920.36x = 69,018,084.53
5. Step 5: Solve for x
   x = 69,018,084.53/12,920.36
6. Step 6: Final answer
   x = 5,341.81