Finding the Fourth Proportional to 42,840.10, 64,275.52 and 19,145.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,840.10 : 64,275.52 = 19,145.67 : x
2. Step 2: Convert to fraction form
   42,840.10/64,275.52 = 19,145.67/x
3. Step 3: Cross multiply
   42,840.10x = 64,275.52 × 19,145.67
4. Step 4: Simplify right side
   42,840.10x = 1,230,597,895.00
5. Step 5: Solve for x
   x = 1,230,597,895.00/42,840.10
6. Step 6: Final answer
   x = 28,725.37