Finding the Fourth Proportional to 721,378, 995,547.72 and 403,426

Step by Step Solution

1. Step 1: Write the proportion equation
   721,378 : 995,547.72 = 403,426 : x
2. Step 2: Convert to fraction form
   721,378/995,547.72 = 403,426/x
3. Step 3: Cross multiply
   721,378x = 995,547.72 × 403,426
4. Step 4: Simplify right side
   721,378x = 401,629,834,488.72
5. Step 5: Solve for x
   x = 401,629,834,488.72/721,378
6. Step 6: Final answer
   x = 556,753.65