Finding the Fourth Proportional to 502,128.72, 692,971.56 and 275,776.56

Step by Step Solution

1. Step 1: Write the proportion equation
   502,128.72 : 692,971.56 = 275,776.56 : x
2. Step 2: Convert to fraction form
   502,128.72/692,971.56 = 275,776.56/x
3. Step 3: Cross multiply
   502,128.72x = 692,971.56 × 275,776.56
4. Step 4: Simplify right side
   502,128.72x = 191,105,312,994.63
5. Step 5: Solve for x
   x = 191,105,312,994.63/502,128.72
6. Step 6: Final answer
   x = 380,590.29