Finding the Fourth Proportional to 772,196.87, 1,158,449.74 and 266,776.31

Step by Step Solution

1. Step 1: Write the proportion equation
   772,196.87 : 1,158,449.74 = 266,776.31 : x
2. Step 2: Convert to fraction form
   772,196.87/1,158,449.74 = 266,776.31/x
3. Step 3: Cross multiply
   772,196.87x = 1,158,449.74 × 266,776.31
4. Step 4: Simplify right side
   772,196.87x = 309,046,946,343.27
5. Step 5: Solve for x
   x = 309,046,946,343.27/772,196.87
6. Step 6: Final answer
   x = 400,217.82