Finding the Fourth Proportional to 42,856.34, 64,301.43 and 13,276.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,856.34 : 64,301.43 = 13,276.49 : x
2. Step 2: Convert to fraction form
   42,856.34/64,301.43 = 13,276.49/x
3. Step 3: Cross multiply
   42,856.34x = 64,301.43 × 13,276.49
4. Step 4: Simplify right side
   42,856.34x = 853,696,970.87
5. Step 5: Solve for x
   x = 853,696,970.87/42,856.34
6. Step 6: Final answer
   x = 19,919.97