Finding the Fourth Proportional to 493,647.32, 740,499.69 and 138,689.03

Step by Step Solution

1. Step 1: Write the proportion equation
   493,647.32 : 740,499.69 = 138,689.03 : x
2. Step 2: Convert to fraction form
   493,647.32/740,499.69 = 138,689.03/x
3. Step 3: Cross multiply
   493,647.32x = 740,499.69 × 138,689.03
4. Step 4: Simplify right side
   493,647.32x = 102,699,180,018.90
5. Step 5: Solve for x
   x = 102,699,180,018.90/493,647.32
6. Step 6: Final answer
   x = 208,041.61