Finding the Fourth Proportional to 61,200.72, 91,781.64 and 19,638

Step by Step Solution

1. Step 1: Write the proportion equation
   61,200.72 : 91,781.64 = 19,638 : x
2. Step 2: Convert to fraction form
   61,200.72/91,781.64 = 19,638/x
3. Step 3: Cross multiply
   61,200.72x = 91,781.64 × 19,638
4. Step 4: Simplify right side
   61,200.72x = 1,802,407,846.32
5. Step 5: Solve for x
   x = 1,802,407,846.32/61,200.72
6. Step 6: Final answer
   x = 29,450.76