Finding the Fourth Proportional to 388,902, 536,685.12 and 210,054

Step by Step Solution

1. Step 1: Write the proportion equation
   388,902 : 536,685.12 = 210,054 : x
2. Step 2: Convert to fraction form
   388,902/536,685.12 = 210,054/x
3. Step 3: Cross multiply
   388,902x = 536,685.12 × 210,054
4. Step 4: Simplify right side
   388,902x = 112,732,856,196.48
5. Step 5: Solve for x
   x = 112,732,856,196.48/388,902
6. Step 6: Final answer
   x = 289,874.71