Finding the Fourth Proportional to 39,899,799.71, 55,061,698.73 and 21,565,085.21

Step by Step Solution

1. Step 1: Write the proportion equation
   39,899,799.71 : 55,061,698.73 = 21,565,085.21 : x
2. Step 2: Convert to fraction form
   39,899,799.71/55,061,698.73 = 21,565,085.21/x
3. Step 3: Cross multiply
   39,899,799.71x = 55,061,698.73 × 21,565,085.21
4. Step 4: Simplify right side
   39,899,799.71x = 1,187,410,224,949,627.50
5. Step 5: Solve for x
   x = 1,187,410,224,949,627.50/39,899,799.71
6. Step 6: Final answer
   x = 29,759,804.15