Finding the Fourth Proportional to 39,870,729.38, 55,021,628.61 and 21,536,014.88

Step by Step Solution

1. Step 1: Write the proportion equation
   39,870,729.38 : 55,021,628.61 = 21,536,014.88 : x
2. Step 2: Convert to fraction form
   39,870,729.38/55,021,628.61 = 21,536,014.88/x
3. Step 3: Cross multiply
   39,870,729.38x = 55,021,628.61 × 21,536,014.88
4. Step 4: Simplify right side
   39,870,729.38x = 1,184,946,612,191,685.50
5. Step 5: Solve for x
   x = 1,184,946,612,191,685.50/39,870,729.38
6. Step 6: Final answer
   x = 29,719,712.45