Finding the Fourth Proportional to 12,740.63, 19,111.80 and 3,380.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,740.63 : 19,111.80 = 3,380.51 : x
2. Step 2: Convert to fraction form
   12,740.63/19,111.80 = 3,380.51/x
3. Step 3: Cross multiply
   12,740.63x = 19,111.80 × 3,380.51
4. Step 4: Simplify right side
   12,740.63x = 64,607,631.02
5. Step 5: Solve for x
   x = 64,607,631.02/12,740.63
6. Step 6: Final answer
   x = 5,070.99