Finding the Fourth Proportional to 20,971,333.35, 31,416,699.15 and 12,860,658.09

Step by Step Solution

1. Step 1: Write the proportion equation
   20,971,333.35 : 31,416,699.15 = 12,860,658.09 : x
2. Step 2: Convert to fraction form
   20,971,333.35/31,416,699.15 = 12,860,658.09/x
3. Step 3: Cross multiply
   20,971,333.35x = 31,416,699.15 × 12,860,658.09
4. Step 4: Simplify right side
   20,971,333.35x = 404,039,426,084,543.62
5. Step 5: Solve for x
   x = 404,039,426,084,543.62/20,971,333.35
6. Step 6: Final answer
   x = 19,266,272.65