Finding the Fourth Proportional to 1,071,128.72, 1,606,716.30 and 388,076.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071,128.72 : 1,606,716.30 = 388,076.51 : x
2. Step 2: Convert to fraction form
   1,071,128.72/1,606,716.30 = 388,076.51/x
3. Step 3: Cross multiply
   1,071,128.72x = 1,606,716.30 × 388,076.51
4. Step 4: Simplify right side
   1,071,128.72x = 623,528,854,264.11
5. Step 5: Solve for x
   x = 623,528,854,264.11/1,071,128.72
6. Step 6: Final answer
   x = 582,123.18