Finding the Fourth Proportional to 21,557,499.60, 32,289,010.20 and 19,164,046.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,557,499.60 : 32,289,010.20 = 19,164,046.80 : x
2. Step 2: Convert to fraction form
   21,557,499.60/32,289,010.20 = 19,164,046.80/x
3. Step 3: Cross multiply
   21,557,499.60x = 32,289,010.20 × 19,164,046.80
4. Step 4: Simplify right side
   21,557,499.60x = 618,788,102,598,477.38
5. Step 5: Solve for x
   x = 618,788,102,598,477.38/21,557,499.60
6. Step 6: Final answer
   x = 28,704,075.80