Finding the Fourth Proportional to 42,835.59, 64,259.53 and 13,255.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42,835.59 : 64,259.53 = 13,255.70 : x
2. Step 2: Convert to fraction form
   42,835.59/64,259.53 = 13,255.70/x
3. Step 3: Cross multiply
   42,835.59x = 64,259.53 × 13,255.70
4. Step 4: Simplify right side
   42,835.59x = 851,804,697.38
5. Step 5: Solve for x
   x = 851,804,697.38/42,835.59
6. Step 6: Final answer
   x = 19,885.44