Finding the Fourth Proportional to 42,947.69, 64,427.60 and 13,368.51

Step by Step Solution

1. Step 1: Write the proportion equation
   42,947.69 : 64,427.60 = 13,368.51 : x
2. Step 2: Convert to fraction form
   42,947.69/64,427.60 = 13,368.51/x
3. Step 3: Cross multiply
   42,947.69x = 64,427.60 × 13,368.51
4. Step 4: Simplify right side
   42,947.69x = 861,301,048.30
5. Step 5: Solve for x
   x = 861,301,048.30/42,947.69
6. Step 6: Final answer
   x = 20,054.66