Finding the Fourth Proportional to 926,510.69, 1,387,956.06 and 638,271.48

Step by Step Solution

1. Step 1: Write the proportion equation
   926,510.69 : 1,387,956.06 = 638,271.48 : x
2. Step 2: Convert to fraction form
   926,510.69/1,387,956.06 = 638,271.48/x
3. Step 3: Cross multiply
   926,510.69x = 1,387,956.06 × 638,271.48
4. Step 4: Simplify right side
   926,510.69x = 885,892,768,591.17
5. Step 5: Solve for x
   x = 885,892,768,591.17/926,510.69
6. Step 6: Final answer
   x = 956,160.33