Finding the Fourth Proportional to 19,212,144.87, 28,772,040.15 and 10,989,858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,212,144.87 : 28,772,040.15 = 10,989,858.72 : x
2. Step 2: Convert to fraction form
   19,212,144.87/28,772,040.15 = 10,989,858.72/x
3. Step 3: Cross multiply
   19,212,144.87x = 28,772,040.15 × 10,989,858.72
4. Step 4: Simplify right side
   19,212,144.87x = 316,200,656,334,667.62
5. Step 5: Solve for x
   x = 316,200,656,334,667.62/19,212,144.87
6. Step 6: Final answer
   x = 16,458,373.52