Finding the Fourth Proportional to 42,880.05, 64,322.51 and 13,302.09

Step by Step Solution

1. Step 1: Write the proportion equation
   42,880.05 : 64,322.51 = 13,302.09 : x
2. Step 2: Convert to fraction form
   42,880.05/64,322.51 = 13,302.09/x
3. Step 3: Cross multiply
   42,880.05x = 64,322.51 × 13,302.09
4. Step 4: Simplify right side
   42,880.05x = 855,623,750.54
5. Step 5: Solve for x
   x = 855,623,750.54/42,880.05
6. Step 6: Final answer
   x = 19,953.89