Finding the Fourth Proportional to 42,803.30, 64,216.80 and 17,855.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,803.30 : 64,216.80 = 17,855.10 : x
2. Step 2: Convert to fraction form
   42,803.30/64,216.80 = 17,855.10/x
3. Step 3: Cross multiply
   42,803.30x = 64,216.80 × 17,855.10
4. Step 4: Simplify right side
   42,803.30x = 1,146,597,385.68
5. Step 5: Solve for x
   x = 1,146,597,385.68/42,803.30
6. Step 6: Final answer
   x = 26,787.59