Finding the Fourth Proportional to 42,937.56, 64,405.18 and 19,238.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,937.56 : 64,405.18 = 19,238.67 : x
2. Step 2: Convert to fraction form
   42,937.56/64,405.18 = 19,238.67/x
3. Step 3: Cross multiply
   42,937.56x = 64,405.18 × 19,238.67
4. Step 4: Simplify right side
   42,937.56x = 1,239,070,004.31
5. Step 5: Solve for x
   x = 1,239,070,004.31/42,937.56
6. Step 6: Final answer
   x = 28,857.49