Finding the Fourth Proportional to 43,196.72, 64,731.89 and 19,151.87

Step by Step Solution

1. Step 1: Write the proportion equation
   43,196.72 : 64,731.89 = 19,151.87 : x
2. Step 2: Convert to fraction form
   43,196.72/64,731.89 = 19,151.87/x
3. Step 3: Cross multiply
   43,196.72x = 64,731.89 × 19,151.87
4. Step 4: Simplify right side
   43,196.72x = 1,239,736,466.35
5. Step 5: Solve for x
   x = 1,239,736,466.35/43,196.72
6. Step 6: Final answer
   x = 28,699.79