Finding the Fourth Proportional to 156,928.51, 236,246.70 and 142,978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   156,928.51 : 236,246.70 = 142,978.15 : x
2. Step 2: Convert to fraction form
   156,928.51/236,246.70 = 142,978.15/x
3. Step 3: Cross multiply
   156,928.51x = 236,246.70 × 142,978.15
4. Step 4: Simplify right side
   156,928.51x = 33,778,116,109.61
5. Step 5: Solve for x
   x = 33,778,116,109.61/156,928.51
6. Step 6: Final answer
   x = 215,245.25