Finding the Fourth Proportional to 51,221,106.42, 76,831,790.84 and 20,928,969.42

Step by Step Solution

1. Step 1: Write the proportion equation
   51,221,106.42 : 76,831,790.84 = 20,928,969.42 : x
2. Step 2: Convert to fraction form
   51,221,106.42/76,831,790.84 = 20,928,969.42/x
3. Step 3: Cross multiply
   51,221,106.42x = 76,831,790.84 × 20,928,969.42
4. Step 4: Simplify right side
   51,221,106.42x = 1,608,010,200,974,196.25
5. Step 5: Solve for x
   x = 1,608,010,200,974,196.25/51,221,106.42
6. Step 6: Final answer
   x = 31,393,507.74