Finding the Fourth Proportional to 42,856.22, 64,299.72 and 19,161.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,856.22 : 64,299.72 = 19,161.76 : x
2. Step 2: Convert to fraction form
   42,856.22/64,299.72 = 19,161.76/x
3. Step 3: Cross multiply
   42,856.22x = 64,299.72 × 19,161.76
4. Step 4: Simplify right side
   42,856.22x = 1,232,095,802.71
5. Step 5: Solve for x
   x = 1,232,095,802.71/42,856.22
6. Step 6: Final answer
   x = 28,749.52