Finding the Fourth Proportional to 42,804.84, 64,219.05 and 17,856.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,804.84 : 64,219.05 = 17,856.60 : x
2. Step 2: Convert to fraction form
   42,804.84/64,219.05 = 17,856.60/x
3. Step 3: Cross multiply
   42,804.84x = 64,219.05 × 17,856.60
4. Step 4: Simplify right side
   42,804.84x = 1,146,733,888.23
5. Step 5: Solve for x
   x = 1,146,733,888.23/42,804.84
6. Step 6: Final answer
   x = 26,789.82