Finding the Fourth Proportional to 493,856.36, 740,784.89 and 138,870.42

Step by Step Solution

1. Step 1: Write the proportion equation
   493,856.36 : 740,784.89 = 138,870.42 : x
2. Step 2: Convert to fraction form
   493,856.36/740,784.89 = 138,870.42/x
3. Step 3: Cross multiply
   493,856.36x = 740,784.89 × 138,870.42
4. Step 4: Simplify right side
   493,856.36x = 102,873,108,109.60
5. Step 5: Solve for x
   x = 102,873,108,109.60/493,856.36
6. Step 6: Final answer
   x = 208,305.73