Finding the Fourth Proportional to 42,805.08, 64,214.52 and 13,215.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,805.08 : 64,214.52 = 13,215.98 : x
2. Step 2: Convert to fraction form
   42,805.08/64,214.52 = 13,215.98/x
3. Step 3: Cross multiply
   42,805.08x = 64,214.52 × 13,215.98
4. Step 4: Simplify right side
   42,805.08x = 848,657,812.03
5. Step 5: Solve for x
   x = 848,657,812.03/42,805.08
6. Step 6: Final answer
   x = 19,826.10