Finding the Fourth Proportional to 42,528.04, 63,798.92 and 12,938.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,528.04 : 63,798.92 = 12,938.91 : x
2. Step 2: Convert to fraction form
   42,528.04/63,798.92 = 12,938.91/x
3. Step 3: Cross multiply
   42,528.04x = 63,798.92 × 12,938.91
4. Step 4: Simplify right side
   42,528.04x = 825,488,301.34
5. Step 5: Solve for x
   x = 825,488,301.34/42,528.04
6. Step 6: Final answer
   x = 19,410.45