Finding the Fourth Proportional to 42,784.87, 64,185.86 and 13,201.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,784.87 : 64,185.86 = 13,201.59 : x
2. Step 2: Convert to fraction form
   42,784.87/64,185.86 = 13,201.59/x
3. Step 3: Cross multiply
   42,784.87x = 64,185.86 × 13,201.59
4. Step 4: Simplify right side
   42,784.87x = 847,355,681.22
5. Step 5: Solve for x
   x = 847,355,681.22/42,784.87
6. Step 6: Final answer
   x = 19,805.03