Finding the Fourth Proportional to 42,556.12, 63,844.47 and 12,972.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,556.12 : 63,844.47 = 12,972.15 : x
2. Step 2: Convert to fraction form
   42,556.12/63,844.47 = 12,972.15/x
3. Step 3: Cross multiply
   42,556.12x = 63,844.47 × 12,972.15
4. Step 4: Simplify right side
   42,556.12x = 828,200,041.51
5. Step 5: Solve for x
   x = 828,200,041.51/42,556.12
6. Step 6: Final answer
   x = 19,461.36