Finding the Fourth Proportional to 21,020,443.78, 31,515,526.14 and 12,916,673.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,020,443.78 : 31,515,526.14 = 12,916,673.86 : x
2. Step 2: Convert to fraction form
   21,020,443.78/31,515,526.14 = 12,916,673.86/x
3. Step 3: Cross multiply
   21,020,443.78x = 31,515,526.14 × 12,916,673.86
4. Step 4: Simplify right side
   21,020,443.78x = 407,075,772,676,684.69
5. Step 5: Solve for x
   x = 407,075,772,676,684.69/21,020,443.78
6. Step 6: Final answer
   x = 19,365,707.83