Finding the Fourth Proportional to 611,131.50, 916,721.82 and 291,118.86

Step by Step Solution

1. Step 1: Write the proportion equation
   611,131.50 : 916,721.82 = 291,118.86 : x
2. Step 2: Convert to fraction form
   611,131.50/916,721.82 = 291,118.86/x
3. Step 3: Cross multiply
   611,131.50x = 916,721.82 × 291,118.86
4. Step 4: Simplify right side
   611,131.50x = 266,875,011,175.53
5. Step 5: Solve for x
   x = 266,875,011,175.53/611,131.50
6. Step 6: Final answer
   x = 436,689.99